dzikaszmija, Probably everyone has been in this situation. But there may be more happening than just invasions that do not have enough space to live. Perhaps your own stones have limited liberties and you haven’t noticed. You have a string with 2 liberties connected to a string with 3 liberties connected
to another string with 2 liberties. Your opponent makes crazy moves, which you answer by preventing eyes. What if your opponent is really preparing to atari your groups, make them connect (maybe forcing you to create an empty triangle or two) and then capture all of them, winning the game.
Or your opponent makes some moves in the corner in your territory, and suddenly it’s seki and even though your group still lives, most of your territory is gone.
Admittedly, this is not usually what is happening, but it could be, and such random moves that destroy you are important situations to learn and recognize.
Just saying…